Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4823377 | System for setting registration mode for key telephone set | Kenichi Kanno, Hisami Ojima | 1989-04-18 |
| 4821316 | Key telephone system | Senji Okumura, Yasuo Kobayashi, Masatoshi Ikeda | 1989-04-11 |
| 4759055 | Key telephone system | Senji Okumura, Katsuyuki Sekine | 1988-07-19 |
| 4754477 | Key telephone system | Kouji Tanaka, Yoshihiro Ikeda, Junzo Kikuchi, Hikaru Sano | 1988-06-28 |
| 4572928 | Key telephone system | Tomio Nishimura, Junzo Kikuchi, Toshiro Yoshida | 1986-02-25 |
| 4514597 | Control of a key telephone system using a pulse width modulated signal | Junzo Kikuchi, Mutsuhiro Yamamoto, Toshiro Yoshida | 1985-04-30 |